Carel mastercella - Description of the Functions; 6.2 Testing the Display and Keypad on Start-up

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ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
6. DESCRIPTION OF THE FUNCTIONS
6.1 Models
Below is a list of the functions relating to the various models of controller.
Function M (*) SYFCH (**) A (***) D (***)
temperature display
99 9 99999
display second probe with external
contact
99 9 99999
temperature alarm monitoring
99 9 99999
compressor control
9999999
defrost with compressor stop
9999999
defrost with heater or hot gas
999999
continuous cycle
9999999
duty setting
9999999
evaporator fans
99999
auxiliary output 1
9999
auxiliary output 2
99
Tab. 6.a
The controllers can be fi tted with a maximum of two auxiliary relays. The associated functions are:
• alarm output, normally open or closed;
• auxiliary output;
• light output;
• second evaporator output;
• control output for pump down valve;
• control output for condenser fans;
• second delayed compressor output,
• auxiliary output, with deactivation when OFF;
• light output, with deactivation when OFF;
• no function associated with the output;
• reverse output in control with dead band;
• second compressor step output;
• second compressor step output with rotation.
The controllers can be fi tted with a maximum of three digital inputs (or three probe inputs).
The associated functions are:
• immediate alarm;
• delayed alarm;
• select probe displayed (model M);
• enable defrost;
• start defrost;
• door switch with compressor and fan shutdown and light management;
• remote ON/OFF;
• curtain switch with set point variation and light management;
• low pressure alarm;
• door switch with fan shutdown and light management;
• direct/reverse selection;
• light sensor and light management;
• door switch with compressor and fans off, without light management;
• door switch with fans off, without light management.
The controllers can be fi tted with a maximum of fi ve probes (three of which as alternatives to the digital
inputs). The associated functions are:
• ambient probe (used to calculate the virtual control probe);
• product probe (if necessary, used to calculate the virtual control probe);
• defrost probe (main or secondary evaporator, end defrost on 3 evaporator temperature probes);
• condenser probe (used, if necessary, for condenser fan control).
Other functions that enhance the range of the refrigeration controllers include:
• real time clock, for management of real time defrosts;
• real time clock for HACCP alarms management;
• real time clock for the activation/deactivation of the AUX and LIGHT outputs;
• real time clock for the automatic variation of the set point
6.2 Testing the display and keypad on start-up
When the controller is switched on, a special procedure tests the display and the keypad:
Phase Display Keypad Note
First Display completely OFF for 2
seconds
Press prg for 2 seconds to set the
default values
Second Display completely ON for 2
seconds
No effect
Third Three segments (‘---’) on Pressing each button lights up a
specifi c segment
In this phase,
appears
to indicate the presence of
the RTC
Fourth Normal operation Normal operation
Tab. 6.b
(*) = ir33 only
(**) = powercompact and ir33 DIN only
(***) = mastercella only